In December Nevada’s Public Utilities Commission decided to upend the state’s net energy metering (NEM) programme, with owners of PV systems facing a higher monthly fee and sharply lower payments for the excess power they generate.

The changes, which went into effect on 1 January, affect both new and existing PV systems.

Having only last week upheld the ruling, Nevada’s regulator has now decided to accept fresh evidence on the impact of the changes for existing PV systems – potentially opening the door to a “grandfathering” policy.